How do I check which version of GDAL I have and how many?

[المشرف العام]

I have installed in my computer the following software:

• PosgresSQL 9.3.2.3
• PostGIS 2.1.1.1
• QGIS 2.0.1 Dufour (this one installed through the OSGeo4w package)
• QGIS 1.7.0 Wroclaw

As far as I know all of them somehow operate, or use, or access the GDAL library.

Are they independent versions of GDAL therefore being used depending on which one of the above software I am using? For instance, If I open the OSGeo4W Shell, just after loading the batch it displays:

GDAL 1.10.1, released 2015/02/10

So, how can I check the other GDAL versions and make comparisons?

Is there any way of centralize all of this stuff and force the apps to use the same centralized folder?



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